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Definition of mischief : 1. Cause of trouble or vexation; trouble.
2. Harm; damage; esp., disarrangement of order; trouble or vexation caused by human agency or by some living being, intentionally or not; often, calamity, mishap; trivial evil caused by thoughtlessness, or in sport.
3. To do harm to.

Synonyms:

whimsicality, slipperiness, wrongdoing, frolicsomeness, impairment, trickery, demureness, wrong, puckishness, trickiness, chicanery, waggishness, devilry, rascal, tomfoolery, high jinks, playfulness, shenanigan, deviltry, blemish, fault, prejudice, good, imp, damage, misbehavior, disadvantage, mischief-making, prankster, sportiveness, prankishness, misdoing, misconduct, shiftiness, balefulness, cutup, loss, roguishness, mischievousness, devil, rogue, chicane, guile, diablerie, devilment, injury, scamp, roguery, rascality, impishness, naughtiness, sedateness, friskiness, hurt, dignity, help, maleficence, wile, harm

infraction, crime, transgression, injustice, outrage, misdemeanor, felony, offense, infringement, breach, violation

detriment, repellency, monstrosity, evil, catastrophe, nefariousness, heinousness, disgrace, bane, badness, sinisterness, repulsiveness, offensiveness, wickedness, abomination, calamitousness, foulness, damnation, reprehensibleness, terribleness, sinfulness, atrocity, ill, hideousness

trouble

Usage examples:

• You have helped me to do all this mischief! - "Lover or Friend", Rosa Nouchette Carey.
• You can make a lot of mischief if you so choose, I know well. - "Red Money", Fergus Hume.
• I believe he's about here and means mischief yet. - "The Stolen Singer", Martha Idell Fletcher Bellinger.